Paper-making.



A. BRANNON.

PAPER MAKING.

APPucATloN man ocT.22,1912. RENEwEn FEB. 10.1917.

l Patented Aug. 21, 1917.

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len Brannon WITH@ STATES ATEIWI IIIIIE.

ALBERT IBRANNON, OF IDAYTON, OHIO, ASSIGNOR TO HOWARD F. v1VIAIEtST0 l\T, OF DAYTON, OHIO.

PAPER-MAKING.

Application filed October 22, 1912, Serial No. 727,190. Renewed February 10, 1917. Serial No. 147,929.

To all whom 'it may concern Be it known that I, ALBERT BRANNON, a citizen of the United States, and a resident of Dayton, in the county of Montgomery and State of Ohio, have invented a certain new and useful Improvement in Paperr Making, of which the following is a specification.

This invention relates to paper making and has for its object to provide an improved process of treating paper in the course of its manufacture whereby there is imparted to the product the essential features of loft-dried paper.

To these ends my improvement comprises manipulation and treatment set forth herein. My improved process may .be carried out or effected by a variety of means, but I may `employ apparatus illustrated in its preferred form in the drawing accompanying this specification wherein the figure' represents a diagramatic side elevation of so much of a paper machine as will serve to illustrate the application of my improvement.

The object of loft-drying or pole-drying paper is to set or fix the sizing and to 1mpart to the `paper strength, toughness and stiffness, as well known in the art. It is further well known that this process is slow and expensive and usually requires a further handling and finishing of the paper to put it in marketable condition. My improved process is directed to the accomplishment of this result before the paper has left the paper machine whereby when said paper is delivered from the machine it is in completed and essentially loft-dried condition. y

I have discovered that, an expeditious and satisfactory Way to' attain these desired results in a web of paper is to chill' the web directly after it has been tub-sized and before its final drying.

In carrying out the steps'of this process, as illustrated in the drawing above referred to I lead the damp web 3, formed by some convenient means not shown. between and around preliminary -heatedI drying rolls '4, 5, 6 yin the well lmown manner andthence around roll 7 in size-tub 8, in some cases squeezing off the surplus size between rolls 9, 10.

In making loft-dried paper it has been customary to remove the web from the machine at this point and hang the paper in lofts to season and dry. During this loftdrying process the paper absorbs the size and said size is dried in. The resultant product differs from the usual machine made paper in severaly particulars well known to those skilled in the art, for instance, loft-dried paper has more strength, stiffness and toughness, and there is imparted thereto a character of snappiness when rattled that is lacking in paper treated by other means.

Patented Aug'. 21, 1917.

Loft drying also im-` parts to the paper a finish and appearance not obtainable heretofore by other treatment. i

I f, however, the web is passed directly from the sizing tub to the heated finishing or redrying cylinders as 19, 20, 21 it results in drawing or burning the size4 and to a greater or less extent in the evaporation of the size thereby preventing the size from entering the pores of the paper and impregnating the fibers thereof. The paper thus produced lacks in a marked degree the desirable and valuable characteristics of loft-dried paper.

Contrary to both these described methods, I, in the practice of'myimprovement, lead said web damp with size through a refrigerating chamber, as 25, which may be conveniently located above the machine as illustrated, if desired. The temperature of said chamber may be reduced to the requisite degree of coldness by the circulation of brine through the coils of pipe 11, 12. I preferably provide a series of cylinders as 13, 14, 15 in said chamber 25 over and `around which I feed said paper web. The continuously moving. web is retained in said charn-V ber a considerable length of ltime for chill-` ing it the requisite amount, -thus causinglor more chilling cylinders, one of which cylinders is indicated in dotted positions at 16. This cylinder may be supported in some 'i doctor 18 for keeping moisture.

convenient manner and `brine circulated through .chambers therein yfrom .pipe 17. If the Web is' chilled upon a cylinderas 16, exposed to the ordinary humidity of a.

room in Which a paper making machine is installed I have found it desirable to use a the cylinder free of loft room Will be apparent to those skilledv `in the art..

It Will be obvious to those skilled in the art that'various arrangements and devices for chilling the damp, Web between its sizing and final drying may be employed Withj in the'scope of my improvement.

:. said web.

It will also be obvious that it is immaterial on What type of forming machine the Web is made and I have'therefore considered it unnecessary to illustrate means for performing such preliminary steps in the formation of the Web.

1. That improvement in the art of maku i, ing paper' whichl consists in applying size to a web or sheetq of paper, then subjecting the sa-idsized paper to `cold until the size has permeated and become'absorbed by and.set in the said paper, and then drying said paper.

\ 2. VThat improvement in the art of mak" .ing paper which consists in applying size to a continuously moving web of paper, then `subjecting the said sized web to cold intil the size has permeated and become absorbed by and set in the said Web, and then drying 3. That imirovement in the'art of'making paper Which consists in applying size to a web of paper immediately succeeding the formation and drying of said Web, then v subjecting the said sized Web to cold until t the size has permeated and become absorbed by and set in the said Web, and then drying said Web.

4. That improvement inthe art ofl making paper which consists in immersing in size a Web or sheet of paper, then squeezing 0H the surface portions of said size, then subjecting the said sized paper to cold'until the size has permeated and become absorbed by and set in the said paper and then drying said paper. l

5. That improvement in the art of making paper which consists in immersing in size a continuously kmoving Web of paper, then squeezing olf the 4surface portions of said size, then subjecting the 6said sized Web to cold until the size has permeated and become absorbedby and set in the said Web, and then drying said web.

61 lThat improvement in the art of making paper which consists in immersing in size a Web of paper immediately succeed-` ing the formation and drying of said `Web,

then squeezing offA the surface portions of said size, then subjecting the said sized web to cold until the size has permeatedand be'- come absorbed'by and set in the said web, and then drying said Web.

7. That improvement in the art of making paper which consists in applying size t0 a web or sheet o f paper, then subjecting said treated paper to lcold. until the size becomes set and then drying the paper, said chilling andl drying operations being adapted to impart to the paper substantially the characteristics of loft dried paper.

8. That improvement in the art of making paper which consists in applying cold to a Web or sheet of paper Jwhich has been previously sized and then drying the paper, said applic-ation of cold to the sized paper being adapted to impart tothe paper substantially the characteristics of loft dried paper.

Signed at Dayton, in the county of Montgomery, and State of Ohio this 19th day of Oct., 1912, before twosu'bscribing Witnesses.

ALBERT .BRANNON Witnesses y HOWARD MARsToN LIBBIE LOGAN. 

